Variation of aggressive interaction among male elementary school children as a function of changes in spatial density

The behavior of children was monitored during unstructured playground activity in areas of differing size. The frequency of fighting increased significantly in the smaller area, although the aggressive episodes were of briefer duration. In addition, the style of aggression differed significantly between the two conditions. Fighting in the smaller area typically involved more than two children. The results are considered in the context of Hediger's critical distance hypothesis (1950).This article is based in part upon a paper presented to the biennial meeting of the Society for Research in Child Development, Denver, April 1975.The authors wish to thank the administration of Crockett Elementary School, San Marcos, Texas, for their cooperation during the course of the research for the study.     

An Improved Approximation to the Exact Solution of the Two-Stage Clonal Growth Model of Cancer

Multistage clonal growth models are of interest for cancer risk assessment because they can explicitly incorporate data on cell replication. Both approximate and exact formulations of the two stage growth model have been described. The exact solution considers the conditional probability of tumors arising in previously tumor-free animals; the approximate solution estimates total probability of tumor formation. The exact solution is much more computationally intensive when time-dependent cell growth parameters are included. The approximate solution deviates from the exact solution at high incidences and probabilities of tumor. This report describes a computationally tractable,'improved approximation'to the exact solution. Our improved approximation includes a correction term to adjust the unconditional expectation of intermediate cells based on the time history of formation of intermediate cells by mutation of normal cells (recruitment) or by cell division in the intermediate cell population (expansion). The improved approximation provided a much better match to the exact solution than the approximate solution for a wide range of parameter values. The correction term also appears to provide insight into the biological factors that contribute to the variance of the expectation for the number of intermediate cells over time.     

Pathways to productivity improvement

A study of productivity in the Machine Tool industry has just been published by the Engineering Employers Federation (EEF). As a member of the Productivity Steering Group, information was available to one of the authors, in an unusually detailed and validated form for the twenty or so individual companies, (though they remain anonymous). It was thought worthwhile to apply methods developed in the Economics and Statistics Department of British Aerospace to this data in order to give pointers to the factors explaining productivity differences. The particular methods referred to were those of the Diagnostic Chart, though considerably simplified to match the data available, and multiple regression analysis. Particular care is necessary in applying the latter technique in productivity analysis if spurious results are to be excluded. The conclusions were as follows: the most favoured path to improved productivity is via increased turnover; changes in productivity are reflected mainly in changes in the ‘profit’ element of value added rather than in the labour cost element; the major factor distinguishing low from high productivity companies is an excess of the manual work force in relation to turnover; increased fixed assets favours increased labour productivity; increased commitment to R & D favours increased labour productivity; these conclusions are, of course, deduced from a study of the machine tool industry in particular, but may well be of applicability to other industries.     

The role, function, and contribution of attribution theory to leadership: A review

The purpose of this article is to review literature that has focused on the role of attributions in leadership processes and to explore and explain how the study of attributions does, and can, contribute to our understanding of the dynamics of leadership. The historical roots of attribution research are discussed, along with early attributional research in the leadership area. Two streams of attributional criticisms are addressed and recent attributional research relevant to leadership is reviewed. We argue and demonstrate that attributions account for significant proportions of the variance in leadership behaviors. We conclude with suggestions for including attributional perspectives in comprehensive models of leader behavior.     

Moving Past Picket Fences: The Meaning of “Home” for Public Housing Residents

The literature on the meaning of “home” has generally focused on creating lists without giving much attention to the context that shapes meanings. Recently, scholars have argued that to understand “home” it is important to know the range of meanings that different people in different contexts give it. In this article, we focus on the meaning of “home” for public housing residents and consider how they construct the meaning of “home” and if they find that meaning in public housing. Our findings suggest that respondents consider their public housing residences to be “home,” and they construct this meaning using the dimensions of home identified in the literature. However, how respondents used these dimensions were, in some ways, different because of the context of living in public housing. Respondents emphasized the social dimension, and this dimension appeared to organize the other dimensions. As such, our findings support arguments that context matters to the meaning of “home.” They also suggest that policymakers need to broaden their understandings of public housing, as places that can be “home,” and use this understanding when making decisions about housing transformations.     

Provision of Auricular Acupuncture and Acupressure in a University Setting

Abstract

Auricular acupuncture using the National Acupuncture Detoxification Association (NADA) protocol ¹ National Acupuncture Detoxification Association. “About NADA”. Available at: http://acudetox.net/about-nada/12-faqs. Accessed May 2, 2013 [Google Scholar] stimulates 5 points in each ear—the Shen Men, sympathetic nervous system, liver, kidney, and lung. This protocol is also known as Acu Detox, and has been used for recovery in community-based settings and drug use treatment programs. It has also been proven to be effective in alleviating stress and enhancing a general sense of well-being. This article describes the auricular acupuncture and acupressure program developed for a university setting and its use as a tool to enhance harm reduction and mental health services.     

A Culturally Competent Family Enhancement and Empowerment Model for African American Parents

The National Association of Social Worker's Standards for Cultural Competence (2002 National Association of Social Workers. 2002. NASW standards for cultural competence in social work practice, Washington, DC: Author.  [Google Scholar]) mandates social work practices that recognize the cultural preferences of different groups in the United States. The NASW Code of Ethic (1996 National Association of Social Workers. 1996. Code of ethics, Washington, DC: NASW Press.  [Google Scholar]) states that social workers have a responsibility to understand culture and its function and to further recognize the strengths that exist in all cultures. This article addresses the void in the social work literature on culturally based and strengths‐oriented family interventions for African American parents. The article describes a culturally competent intervention model developed by the MAAT Center for Human and Organizational Enhancement, Inc. in Washington, D.C. for parents of African American male youths who live in high‐risk environments. The family enhancement and empowerment model (FEEM) is based on Africentric social work principles that are grounded in a strengths perspective. The article describes the FEEM program, including a discussion of practical strategies for building trust and offering support to African American parents and families.     

Problem gambling,familial violence and alcohol misuse: exploring the triad for treatment-seekers

Research into the co-occurrence of problem gambling, familial violence, and alcohol misuse is limited. While these issues have been considered in combination (i.e. violence and alcohol misuse, problem gambling and alcohol misuse, problem gambling and violence), within Australia, in particular, there has been an absence of exploration of this triad. The current research attempts to fill the gap in the literature, to establish whether there is any difference between problem gamblers with co-occurring violence and problem gamblers who had not experienced violence in terms of their alcohol misuse and gambling behaviours. Interviews were conducted with 81 treatment-seeking problem gamblers to explore how a history of victimization only, perpetration only, victimization and perpetration, or no history of family violence impacted on gambling behaviours (including baseline Victorian Gambling Screen), as well as alcohol misuse. Results indicated that in this treatment-seeking sample there were no significant differences for gambling behaviours or alcohol misuse between problem gamblers with issues of violence and those without. Males demonstrated (on average) a greater tendency toward hazardous drinking or disordered alcohol use. It would be prudent for treatment services to routinely examine problem gamblers' history of violence and alcohol misuse until research verifies the nature of this triad.     

Coitus‐dependent contraceptives: Factors associated with effective use

The factors associated with adequate contraceptive use among university women relying on coitus‐dependent contraceptives were examined. Sixty‐nine sexually active women between the ages of 18 and 34 completed daily logs of their sexual activity, contraceptive behavior and basal body temperature over three menstrual cycles. Contraceptive use was analyzed by menstrual cycle phase and results indicated that frequency of use was significantly higher during the ovulatory phase as compared to the menstrual period. Additional findings using discriminant function analysis indicated that compared to risk takers, non‐risk takers were more likely to initiate sexual intercourse, have more orgasms, have a non‐Catholic background, be living with their partners and have been in their relationships longer. These data suggest that women in less stable relationships and with more sexual inhibitions may be more at risk of an unwanted pregnancy.